Re: Arrays of many different (sub)classes

[Robert Clipsham]

On 24/04/10 20:06, Joseph Wakeling wrote:

Hello all,

Occasionally in C++ I find it useful to build an array which contains
classes of multiple different types all using the same interface -- by
constructing an array of pointers to some common base class, e.g.

class BaseClass {
     // blah, blah ...
};

class A : BaseClass {
     // ... blah ...
};

class C : BaseClass {
     // ... blah ...
};

int main()
{
     vector<BaseClass *>  vec;
     vec.push_back(new A());
     vec.push_back(new C());
     // etc. etc.
}

(This code might be wrong; I'm just typing it to give the idea.  And in
practice, I usually do not use 'new' statements but pass pointers to
already-existing objects...:-)

Anyway, the point is that at the end of the day I have an array of
different objects with a common interface.  What's the appropriate way
to achieve the same effect in D?

Thanks&  best wishes,

     -- Joe

This should do what you want:
----
class BaseClass {
    // blah, blah ...
}

class A : BaseClass {
    // ... blah ...
}

class C : BaseClass {
    // ... blah ...
}

int main()
{
    BaseClass[] vec;
    vec ~= new A;
    vec ~= new C;
    // etc. etc.
}
----